/*
 * Copyright (c) 2019, 2019, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */
package com.oracle.svm.core;

// Checkstyle: allow reflection

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;

import org.graalvm.nativeimage.Platform;
import org.graalvm.nativeimage.Platforms;

/**
 * Wrapper for the {@link InvocationHandler} used by the JDK for annotations. During image
 * generation, it makes the annotation properties available by delegating to the JDK invocation
 * handler. At run time, the properties are stored directly in the annotation objects. See the
 * hosted class AnnotationSupport for details.
 */
public final class SubstrateAnnotationInvocationHandler implements InvocationHandler {

    @Platforms(Platform.HOSTED_ONLY.class) //
    private final InvocationHandler hostedInvocationHandler;

    @Platforms(Platform.HOSTED_ONLY.class)
    public SubstrateAnnotationInvocationHandler(InvocationHandler hostedInvocationHandler) {
        this.hostedInvocationHandler = hostedInvocationHandler;
    }

    @Override
    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
        if (SubstrateUtil.HOSTED) {
            return hostedInvocationHandler.invoke(proxy, method, args);
        } else {
            throw new IllegalArgumentException("InvocationHandler for annotations must not be used. Method: " + method.toString());
        }
    }
}
